Brake arrangement for six-wheel trucks.



J. C. WHITRIDGE & G. T. JOHNSON.

BRAKE ARRANGEMENT FOR SIX WHEEL TRUCKS.

2 SHEETS-SHEET I.

Patented July 3, 1917.

APPLICATION FILED MAY 9- 1917- Azflorneys W! NESSES J. C. WHITRIDGE & G.T. JOHNSON.

BRAKE ARRANGEMENT FOR SIX WHEEL TRUCKS.

4 APPLICATION FILED MAY 9. 1917. 1,232,145.

Patented July 3, 1917.

2 SHEETS-SHEET 2.

STATES JOHN WHITRIDGE AND GEORGE T. JOHNSON, OF COLUMBUS, OHIO,ASSIGNURS T0 THEZBUCKEYE STEEL CASTINGS COMPANY, OF COLUMBUS, OHIO.

BRAKE ARRANGEMENT FOR SIX-WHEEL TRUCKS.

Specification of Letters Patent.

Patented Jul 3, 1917.

Original application filed April 21, 1916, Serial No. 92,639. Dividedand tliis application filed May 9, 1917.

Serial No. 167,516.

To (11110710771 it may concern Be it known that we, JOHN C. \VHIITRIDGEand Greece T. JoHNsox, citizens of the United States, and residents ofColumbus, in the county of Franklin and State of Ohio, have inventedcertain new and useful Improvements in Brake Arrangements for Six-W'heel Trucks; and we do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

Our invention relates to an improvement in brake arrangement for sixwheel trucks, adapted particularly for use withthe truck shown in PatentNo. "1,153,741 granted to us September 14th, 1915, and is a division ofapplication No. 92,639 filedby us April 21st, 1916. I

The object ofthe invention is to provide a construction that will becomparatively sim ple and that will equalize the brake pressure on allwheels at the same time, and it consists in the parts and combinationsof parts as will be more fullyexplained and pointed out in the claims.

In the accompanying drawings; Figure 1 is a view in plan of a truckembodying our invention; Fig. 2 is a view in side elevation of the sameand Figs. 3 and 4: are views in plan and side elevation respectively ofa modified construction.

This improvement is designed particularly for six wheel trucks wherein amain bolster 8 is supported at its ends on the auxiliary bolsters 9 and10.

The main bolster 8 extends lengthwise the truck and is mounted at itsends on seats formed in or on the auxiliary bolsters 9 and 10. Theselatter bolsters extend transversely of the truck, one being located in aplane between the axle 1:") and the middle axle 12, and the otherbetween the middle axle 12 and the axle 16, and each is preferablyprovided with an opening located centrally with relation to its ends forthe reception of the ends of the main bolster 8.

The brake beams 17 are hung from the truck side frames and the brakeshoes 18 are keyed to the brake beams in the usual manner.

In the construction shown in Figs. 1 and 2 the brake beams17 areactuated by thelevers 19, disposed diagonally so that their upper endsare to one side of the main. bolster 8 and all connections between thelever and the chains or red from the brake actuating mechanism on thebody of the car, will its lower end by the compression member 25 to thelower end of lever 26 which latter is provided at its upper end with anoblong slot bracket 29. This lever 26 is connected centrallyintermediate its ends to the adjacent brake beam.

The'upper end of said lever 19 is connected at its upper end with theupper end of the lever 19, located intermediate the central axle andauxiliary bolster 9, by the tension member 25*. The levers 19 atopposite sides of the bolster 9 are pivotally connected intermediatetheir ends to their respective brake beams 17 and are connected at theirlower ends by the compression member 20, the upper end of the lever 19at the outer side of the bolster 9 being free for the attachment theretoof the brake mechanism of the ear.

The floating levers 19 at the opposite sides of bolster 9 preferablypass through the looped guides 249, secured to said bolster, whichguides operate to prevent any undue sidewise or swinging movement of thesaid levers. i

The construction shown in Figs. 3 and 4 is identical with that shown inFigs. 1 and 2 except that the levers are arranged in pairs, two to eachbrake beam and are vertical, instead of diagonally disposed.

With this construction it will be seen that when a pulling stress isexerted on the upper ends of the two levers at the outer side of bolster9, the brake shoes of all three brake beams will be forced into contactwith their respective wheels, and as the entire equipment is flexible,the brake pressure on all the wheels will be the same, by properlyproportioning the various levers.

In each of the above forms the brake mechanism is wholly outside, of themain and auxiliary bolsters, and is consequently 27 for the passage ofpin 28 carried by the invention.

readily accessible for repairs or readjustment, and with thearrangements shown it is possible by properly proportioning the leversto equalize the brake pressure or get the same brake pressure on all thewheels at the same time.

It is evident that many slight changes might be resorted to in therelative arrangement of parts shown and described without departing fromthe spirit and scope of our Hence we would have it understood that we donot wish to confine ourselves to the exact construction and arrangementof parts shown and described, but

Having fully described our invention what we claim as new and desire tosecure by Letters-Patent, is V 1. In a brake rigging for six wheeltrucks the combination of a main bolster and auxiliary bolsterssupporting the main bolster, a lever having a pivot pointv at its upperend, a brake beam pivotally connected to said lever between theextremities thereof, a compression member connecting the lower end ofsaid lever with the lower end of a second lever having a pivot pointbetween its extremities, a tension member connecting the upper end ofsaid lever with the upper end of a third lever, a second brake beampivotally connected to said third lever between the extremities thereof,a compression member pivotally connecting the lower end of the latterlever with the lower end of a fourth lever, and a third brake beampivot- Copies of this patent may be obtained for ally connected to saidfourth lever, between the extremities thereof, the upper end of saidlever being free for the attachment of the brake mechanism of the carbody.

2. In a brake rigging for six wheel trucks, the combination of a mainbolster and auxiliary bolsters supporting the main bolster, levers eachpivoted at its upper end, a brake beam connected to said levers betweenthe extremities thereof, compression members connecting the lower endsof said levers with the lower ends of a second pair of levers, each ofthe latter being pivoted intermediate its ends, tension membersconnecting the upper ends of said second levers with the upper ends of athird pair of levers, a second brake beam connected to said third pairof levers between the extremities thereof, compression membersconnecting the lower ends of the third pair of levers with the lowerends of a fourth pair of levers, and a third brake beam connected tosaid latter levers between the ends thereof, the upper ends of thefourth pair of levers being free for the attachment of the brakemechanism of the car body.

In testimony whereof, we have signed this specification in the presenceof two subscribing witnesses.-

JOHN C. WHITRIDGE. GEORGE T. JOHNSON. 'Witnesses:

J OHN W. LEYSHON, C. E. EBERT.

five cents each, by addressing the Commissioner of Patents, Washington,D. C.

